Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 138

Augers bore well in the direction of the grain of the wood, which centre bits will not do in most woods, unless they have a screw in place of the pin (see Fig. 386, p. 107). Augers are made complete in themselves, and used to bore holes of considerable depth and size in wood. They consist of a steel rod, having a round eye at one end through which a round wooden handle fits at right angles; at the other end is a spiral twist of larger diameter, terminating in a conical screw with a sharp point; the edge of the spiral is a nicker which cuts the grain of the wood around the edge of the hole (see Fig. 410). When using an auger, most power is obtained by standing over the work and boring downwards; a little grease should be used with it. Screw bits replace large augers in cabinet work.

Fig. 410.—Auger.